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| Author | Kirkpatrick, J.F.; Liu, I.M.; Turner, J.W.J.; Naugle, R.; Keiper, R. | ||||
| Title | Long-term effects of porcine zonae pellucidae immunocontraception on ovarian function in feral horses (Equus caballus) | Type | Journal Article | ||
| Year | 1992 | Publication | Journal of reproduction and fertility | Abbreviated Journal | J Reprod Fertil |
| Volume | 94 | Issue | 2 | Pages | 437-444 |
| Keywords | Animals; Contraception, Immunologic/*veterinary; *Egg Proteins; Estrogens, Conjugated (USP)/urine; Female; Glycoproteins/*pharmacology; Horses/immunology/*physiology; *Membrane Glycoproteins; Ovary/drug effects/*physiology; Progesterone/metabolism; *Receptors, Cell Surface; Swine/immunology; Time Factors; Zona Pellucida/*immunology | ||||
| Abstract | Ten feral mares free-roaming in Maryland, USA, were inoculated with porcine zonae pellucidae (PZP) protein before the breeding season for three consecutive years (1988-90). Ovarian function was monitored for 51 days during the peak of the breeding season after the third annual PZP inoculation, in seven of these mares and in four untreated control mares, by means of urinary oestrone conjugates and nonspecific progesterone metabolites. None of the ten inoculated mares became pregnant in 1990, compared with 55% of 20 control mares, which included two of the four monitored for ovarian function. Three of the untreated mares demonstrated apparent normal ovarian activity, characterized by preovulatory oestrogen peaks, concurrent progesterone nadirs at ovulation, breeding activity, and luteal-phase progesterone increases after ovulation. Two of the seven monitored PZP-treated mares demonstrated ovulatory cycles that did not result in conception. One was pregnant as a result of conception in 1989 and demonstrated a normal, late-gestation, endocrine profile. The remaining four PZP-treated mares revealed no evidence of ovulation, and urinary oestrogen concentrations were significantly depressed. The experiments indicated that (i) a third consecutive annual PZP booster inoculation is greater than 90% effective in preventing pregnancies in mares and (ii) three consecutive years of PZP treatment may interfere with normal ovarian function as shown by markedly depressed oestrogen secretion. | ||||
| Address | Deaconess Research Institute, Billings, MT 59102 | ||||
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| ISSN | 0022-4251 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:1317449 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 145 | ||
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| Author | Kirkpatrick, J.F.; Wiesner, L.; Kenney, R.M.; Ganjam, V.K.; Turner, J.W. | ||||
| Title | Seasonal variation in plasma androgens and testosterone in the North American wild horse | Type | Journal Article | ||
| Year | 1977 | Publication | The Journal of endocrinology | Abbreviated Journal | J Endocrinol |
| Volume | 72 | Issue | 2 | Pages | 237-238 |
| Keywords | Androgens/*blood; Animals; Horses/*blood; Male; *Seasons; Testosterone/*blood | ||||
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| ISSN | 0022-0795 | ISBN | Medium | ||
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| Notes | PMID:845536 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 148 | ||
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| Author | Kirkpatrick, J.F.; Vail, R.; Devous, S.; Schwend, S.; Baker, C.B.; Wiesner, L. | ||||
| Title | Diurnal variation of plasma testosterone in wild stallions | Type | Journal Article | ||
| Year | 1976 | Publication | Biology of reproduction | Abbreviated Journal | Biol Reprod |
| Volume | 15 | Issue | 1 | Pages | 98-101 |
| Keywords | Animals; *Circadian Rhythm; Horses/*blood; Male; Montana; Sexual Behavior, Animal; Species Specificity; Testosterone/*blood | ||||
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| ISSN | 0006-3363 | ISBN | Medium | ||
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| Notes | PMID:986195 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 149 | ||
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| Author | Kraus-Hansen, A.E.; Fackelman, G.E.; Becker, C.; Williams, R.M.; Pipers, F.S. | ||||
| Title | Preliminary studies on the vascular anatomy of the equine superficial digital flexor tendon | Type | Journal Article | ||
| Year | 1992 | Publication | Equine veterinary journal | Abbreviated Journal | Equine Vet J |
| Volume | 24 | Issue | 1 | Pages | 46-51 |
| Keywords | Angiography/veterinary; Animals; Exercise Test/veterinary; Forelimb; Horses/*anatomy & histology/surgery; Microcirculation; Microscopy, Electron, Scanning; Tendons/*blood supply/surgery/ultrastructure | ||||
| Abstract | The vascular and microvascular anatomy of normal equine superficial digital flexor tendons was studied by dissection of vinyl-perfused specimens and by microangiography on high detail film. The presence of an extensive intratendinous vascular latticework was confirmed, and a 'nutrient artery' described closely associated with the accessory ligament of the superficial digital flexor tendon (proximal check ligament). Circumferential stripping of the paratenon from the tendon to eliminate afferent vessels was performed bilaterally in three horses and unilaterally in a fourth, followed by a treadmill training regimen. No resulting intratendinous lesions could be documented on gross post mortem and histological examination at three, 10, or 35 days post operatively. There was mild paratendinous proliferation in all instances. In one horse, four intratendinous ligatures were placed within the medial and lateral borders of the contralateral tendon to isolate further from its blood supply a 10 cm segment. Gross lesions at 35 days post operatively included a marked paratendinous response involving the entire 10 cm segment, and a darkened, soft focus within the core of the tendon. Histopathology and electron microscopy demonstrated focal degeneration. It was concluded that the blood supply of the normal equine superficial digital flexor tendon is primarily intratendinous, rather than paratendinous as previously thought. The lesions in one horse similar to those in naturally occurring tendinitis supported a vascular aetiology of the disease, and set the groundwork for studies aimed at the development of a clinically relevant tendinitis model. | ||||
| Address | Department of Surgery, Tufts University School of Veterinary Medicine, North Grafton, Massachusetts 01536 | ||||
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| ISSN | 0425-1644 | ISBN | Medium | ||
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| Notes | PMID:1555540 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 151 | ||
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| Author | Schwarzenberger, F.; Mostl, E.; Bamberg, E.; Pammer, J.; Schmehlik, O. | ||||
| Title | Concentrations of progestagens and oestrogens in the faeces of pregnant Lipizzan, trotter and thoroughbred mares | Type | Journal Article | ||
| Year | 1991 | Publication | Journal of reproduction and fertility. Supplement | Abbreviated Journal | J Reprod Fertil Suppl |
| Volume | 44 | Issue | Pages | 489-499 | |
| Keywords | Animals; Estrogens/*analysis; Feces/*chemistry; Female; Gestational Age; Horses/*metabolism; Immunoenzyme Techniques; Labor, Obstetric; Pregnancy; Pregnancy, Animal/*metabolism; Pregnenes/analysis; Progestins/*analysis | ||||
| Abstract | Faecal samples were collected at weekly intervals from pregnant Lipizzan mares during Weeks 7-16 following mating and from Lipizzan, Trotter and Thoroughbred mares during the last 3 months of gestation. After parturition, samples were taken daily from the Thoroughbred mares for another 6 days. Non-pregnant mares served as controls. The concentrations of unconjugated oestrogens (Eg), 20 alpha-OH-progestagens (20 alpha-G) and 20 beta-OH-progestagens (20 beta-G) were measured by enzyme immunoassay. In the faeces of Lipizzan mares, immunoreactive progestagens were significantly (P less than 0.01) elevated above the levels in non-pregnant mares by Week 11, and Eg by Week 13 of pregnancy onwards. During the last 3 months of gestation, concentrations of Eg were significantly higher in Trotter mares than in Lipizzan and Thoroughbred mares. Concentrations of 20 alpha-G and 20 beta-G increased to maximal values in the last month of gestation. There was no significant difference among the 3 breeds with respect to 20 alpha-G but, during the 10 weeks before parturition, concentrations of 20 beta-G in the Lipizzan mares were significantly lower (P less than 0.05) than those in the Thoroughbred mares. They were also significantly lower than those of the Trotter mares during the last 4 weeks of gestation. After parturition, the concentrations of Eg and progestagens had declined to baseline values by Days 3 and 4 respectively. From these results we conclude that high concentrations of progestagens with 20 alpha- and 20 beta-hydroxyl groups are present in the faeces of pregnant mares, especially during the last month of gestation. | ||||
| Address | Institut fur Biochemie, Veterinary Medical University, Vienna, Austria | ||||
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| ISSN | 0449-3087 | ISBN | Medium | ||
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| Notes | PMID:1795293 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 322 | ||
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| Author | Heitor, F.; do Mar Oom, M.; Vicente, L. | ||||
| Title | Social relationships in a herd of Sorraia horses Part I. Correlates of social dominance and contexts of aggression | Type | Journal Article | ||
| Year | 2006 | Publication | Behavioural Processes | Abbreviated Journal | Behav. Process. |
| Volume | 73 | Issue | 2 | Pages | 170-177 |
| Keywords | Age Factors; *Aggression; Animals; Female; *Hierarchy, Social; Horses/*psychology; Male; Sex Factors; *Social Dominance; *Social Environment; Statistics, Nonparametric | ||||
| Abstract | Factors related to dominance rank and the functions of aggression were studied in a herd of Sorraia horses, Equus caballus, under extensive management. Subjects were 10 adult mares 5-18 years old and a stallion introduced into the group for breeding. Dominance relationships among mares were clear, irrespective of rank difference, and remained stable after introduction of the stallion. The dominance hierarchy was significantly linear and rank was positively correlated with age and total aggressiveness. Higher-ranking mares received lower frequency and intensity of agonistic interactions. Nevertheless, higher-ranking dominants were not more likely to elicit submission from their subordinates than lower-ranking dominants. Neither close-ranking mares nor mares with less clear dominance relationships were more aggressive towards each other. Agonistic interactions seemed to be used more importantly in regulation of space than to obtain access to food or to reassert dominance relationships. Contexts of aggression were related to mare rank. The results suggest that dominance relationships based on age as a conventional criterion were established to reduce aggressiveness in a herd where the costs of aggression are likely to outweigh the benefits. | ||||
| Address | Centro de Biologia Ambiental, Faculdade de Ciencias da Universidade de Lisboa, Campo Grande, Edificio C2, 1749-016 Lisboa, Portugal | ||||
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| ISSN | 0376-6357 | ISBN | Medium | ||
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| Notes | PMID:16815645 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 292 | ||
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| Author | VanDierendonck, M.C.; de Vries, H.; Schilder, M.B.H. | ||||
| Title | An Analysis of Dominance, Its Behavioural Parameters and Possible Determinants in a Herd of Icelandic orses in Captivity | Type | Journal Article | ||
| Year | 1995 | Publication | Netherlands Journal of Zoology | Abbreviated Journal | Netherl. J. Zool. |
| Volume | 45 | Issue | 3-4 | Pages | 362-385 |
| Keywords | Dominance; rank order; horses; Icelandic horses. | ||||
| Abstract | Th e applicability of the concept of dominance was investigated in a captive herd of  Icelandic horses and  ponies of diff erent breeds. Eight out of  behaviours possibly related to dominance occurred frequently enough to be investigated in detail. For these eight agonistic behaviours the coverage, the unidirectionality in the exchange, and the degree of transitivity (Landau`s linearity index) were calculated. Four off ensive behaviours, together with avoidance, were suitable for further analysis with regard to dominance. Th e patterns of asymmetries with which these behaviours were exchanged were suffi ciently similar as to justify the application of the dominance concept and to construct a (nearly) linear dominance hierarchy. Th e rank order of the castrated stallions was completely linear, the hierarchy of the mares was almost completely linear. Th e results suggest that off ensive and defensive aggressive behaviours should be treated separately and that the concept of dominance is applicable. However, ritualized formal dominance signals between adult horses appear to be (almost) absent. Th e rank positions of the individuals were correlated with age and residency in the herd but not with height. Middle ranking horses tended to be more frequently in the close vicinity of another horse than high ranking or low ranking horses. Over and above this correlation at the individual level, it was found that pairs of horses close in rank to each other were more often also spatially close to each other. Being in oestrus did not infl uence the dominance relationships between mares. For castrated stallions the rank positions were correlated with the age at which they were castrated. Th is suggests that in male horses experience prior to neutering infl uences the behaviour afterwards. |
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| Notes | Approved | no | |||
| Call Number | refbase @ user @ | Serial | 440 | ||
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| Author | Kumar, P.; Timoney, J.F.; Southgate, H.H.; Sheoran, A.S. | ||||
| Title | Light and scanning electron microscopic studies of the nasal turbinates of the horse | Type | Journal Article | ||
| Year | 2000 | Publication | Anatomia, histologia, embryologia | Abbreviated Journal | Anat Histol Embryol |
| Volume | 29 | Issue | 2 | Pages | 103-109 |
| Keywords | Animals; Female; Horses/*anatomy & histology; Male; Microscopy, Electron, Scanning; Turbinates/*cytology/ultrastructure | ||||
| Abstract | The nasal turbinates of 5 young horses were studied by light and scanning electron-microscopy. Stratified cuboidal epithelium lined the rostral part of the dorsal and ventral nasal turbinates of the vestibular region. The polyangular microvillus cells of this region were separated by linear depressions. The mid and caudal parts of the dorsal and ventral nasal turbinates and the rostral part of the ethmoturbinates were lined by pseudostratified columnar ciliated respiratory epithelium. Numerous cilia with dilated blebs on the ciliated cells concealed adjacent non-ciliated supporting cells and goblet cells. The olfactory zone consisting of the olfactory vesicle and a dense network of olfactory cilia localized to the caudal part of the ethmoturbinates. The three regions were delineated from each other by transitional zones. | ||||
| Address | Gluck Equine Research Center, University of Kentucky, Lexington 40546-0099, USA | ||||
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| ISSN | 0340-2096 | ISBN | Medium | ||
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| Notes | PMID:10932387 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 505 | ||
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| Author | Deuel, N.R.; Lawrence, L.M. | ||||
| Title | Laterality in the gallop gait of horses | Type | Journal Article | ||
| Year | 1987 | Publication | Journal of biomechanics | Abbreviated Journal | J Biomech |
| Volume | 20 | Issue | 6 | Pages | 645-649 |
| Keywords | Animals; *Functional Laterality; *Gait; Horses/*physiology; Kinesis | ||||
| Abstract | Bilateral asymmetry in gallop stride limb contact patterns of four Quarter Horse fillies was documented by high-speed cinematography. Horses were filmed with rider by two cameras simultaneously while galloping along a straightaway. Even though signaled for each gallop lead an equivalent number of times, horses frequently switched leads, selecting the left lead nearly twice as often as the right. Velocities and stride lengths were greater for the left lead than the right, but stride frequencies did not differ between leads. Velocity effects were partitioned out in limb contact data analysis to enable the determination of persistent gallop stride asymmetries. The contact duration for the trailing (right) fore limb on the left lead exceeded the contact duration for the trailing (left) fore limb on the right lead. Selecting the right fore limb as the trailing fore limb may have allowed horses to use it to withstand the greater stresses and caused them to preferentially gallop with the left fore limb leading. Laterality may have an important influence on equine gallop motion patterns and thereby influence athletic performance. | ||||
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| ISSN | 0021-9290 | ISBN | Medium | ||
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| Notes | PMID:3611140 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 528 | ||
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| Author | Proudman, C.; Pinchbeck, G.; Clegg, P.; French, N. | ||||
| Title | Equine welfare: risk of horses falling in the Grand National | Type | Journal Article | ||
| Year | 2004 | Publication | Nature | Abbreviated Journal | Nature |
| Volume | 428 | Issue | 6981 | Pages | 385-386 |
| Keywords | Accidental Falls/prevention & control/*statistics & numerical data; Animal Welfare; Animals; Great Britain; Horse Diseases/prevention & control; Horses/*physiology; Odds Ratio; Risk Assessment; *Sports | ||||
| Abstract | As in other competitive sports, the famous Grand National steeplechase, which is held at Aintree in the United Kingdom and is watched by 600 million people worldwide, sometimes results in injury. By analysing data from the past 15 Grand National races (consisting of 560 starts by horses), we are able to identify several factors that are significantly associated with failure to complete the race: no previous experience of the course and its unique obstacles, unfavourable ground conditions (too soft or too hard), a large number of runners, and the length of the odds ('starting price'). We also find that there is an increased risk of falling at the first fence and at the jump known as Becher's Brook, which has a ditch on the landing side. Our findings indicate ways in which the Grand National could be made safer for horses and illustrate how epidemiological analysis might contribute to preventing injury in competitive sport. | ||||
| Address | Epidemiology Group, Faculty of Veterinary Science, University of Liverpool, Leahurst, Neston, Wirral CH64 7TE, UK. c.j.proudman@liverpool.ac.uk | ||||
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| ISSN | 1476-4687 | ISBN | Medium | ||
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| Notes | PMID:15042079 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 535 | ||
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